New Medical Billing-Code Provides Precision; Nine Codes for Macaw Mishaps  Today, hospitals and doctors use a system of about 18,000 codes to describe medical services in bills they send to insurers, Anna Wilde Matthews reported in the Wall Street Journal not too long ago.  Apparently, that doesn't allow for quite enough nuance.: A new federally mandated version will expand the number to around 140,000—addi ...